cameroon gce intermediate level 2023 material technology and workshop processes 2

SECTION A: MATERIALS TECHNOLOGY AND WORKSHOP PROCESSES

Answer Any THREE questions from this section

a) Give three main objectives of industrial safety. (1.5 marks)
b) Define the accidents listed below: (3 marks)
- b-i. Near accident
- b-ii. Trivial accident
- b-iii. Fatal accident
c) Give TWO effects each on the following causes of an accident; (2 marks)
- c-i. Direct cause of an accident.
- c-ii. Indirect cause of an accident
d) Accidents may occur due to human, mechanical and environmental causes. Explain with at least two example each on the following causes of accidents. (2 marks)
e) State two safety precautions to be observed in the gas welding shop. (1 mark)
f) Name two kinds of fire extinguishers. (0.5 mark)

a) Give TWO examples each of the following properties of metal: (4 marks)
- a-i. Physical property.
- a-ii. Mechanical property.
- a-iii. Thermal property.
- a-iv. Magnetic property.
b) What is recrystallization? (0.5 mark)
c) Why do we heat-treat a metal? (0.5 mark)
d) State any two hardness test methods that are carried metals. (1 mark)
e) The choice of materials for engineering purposes depends on four main factors, name them. (2 marks)
f) Draw a temperature – time graph for the heat treatment process hardness. (2 marks)

a) Identify the following ores used in the production of iron. (3 marks)
- a-i. $Fe_3O_4$
- a-ii. $FeCO_3$
- a-iii. $Fe_2O_3$
b) To produce iron, a charge of ore, coke and limestone are dropped into the top of the blast furnace. Give the function of coke and limestone in the process. (2 marks)
c) Name two furnaces used in the production of steel. (1 mark)
d) What are the raw materials required for producing steel? (1.5 marks)
e) Give the name of the device used to measure furnace temperature. (1 mark)
f) Copy and complete the table below in your answer booklets, giving one effect of each impurity on steel. (1.5 mark)